Hi OP, I'm going to come at this from a different angle to most of the posters on here, because I understand your dread of engaging with the system and being being dependent on others, possibly being patronised and denied autonomy in a healthcare setting. I get it, because it's something I struggle with very much myself. I'd much prefer to have as much control as possible, sadly the NHS aren't always set up for that. I have ongoing health issues now that require me to regularly engage with the surgery, struggle to book appointments and tests and reorder prescriptions, and I cannot tell you how much I hate it all. It's visceral, and rationality has nothing to do with it.
Fortunately I have found a super GP who understands and we've worked out a way we can handle it and I can stay on my meds, which I need. For instance, I don't have my BP taken in the surgery, it will only rocket sky high and not provide any useful information, so I take it at home over a week and we record the average.
What I would say to you is this. This just a fairly short period of time in the scheme of things that you need to get through, it's not a lifetime condition, and it's both you and the baby who need a quick check up from time to time. Chances are everything will be fine, but they do them for a reason - I too ended up in hospital for a week with suspected pre-eclampsia when I had no symptoms. The consequences when things do go wrong aren't ones any of us would want to happen. Also, if you completely duck out of things, the chances are you will set hares running, eg with social services, that will be far more hassle, and last for far longer, than knuckling down and at least trying to engage somewhat with the process. I know it's a hassle, but can you just steel yourself and get it done with, then tell yourself well done and go for a coffee? Maybe take someone with you if it gives you more confidence?
I really wish you well with all this. x